Significant loss of eastern hemlock (Tsuga canadensis) dominated forest is occurring in the eastern United States due to hemlock woolly adelgid (HWA; Adelges tsugae), an aphid-like insect pest. Responding to HWA infestation, many landowners log their hemlock forests. Logged forest experiences more sudden disturbance than infested hemlock forest. This may impact non-hemlock tree growth. Growth of recruited trees versus established trees could vary due to light changes. Hemlocks’ growth is expected to change as they experience canopy loss due to HWA. We measured these growth rates in a long-term ecological experiment established in 2004. Eight 90x90m forest plots were established in Harvard Forest’s Simes tract near the Quabbin watershed. Four plots are untreated hemlock or deciduous forest. Two plots are girdled hemlock forest, emulating standing death from HWA. Two plots are logged hemlock forest, emulating timber harvest patterns by landowners facing HWA infestation. Diameter at breast height is measured every 5 years for all living trees with a diameter above 5 cm. An estimation of tree vigor based on canopy health is assigned to all hemlock trees. Growth rates from the past 20 years are analyzed with R to create graphs of basal area varied on species, treatment, and time. Hemlocks show decreased basal area growth since infestation with HWA. Data on the loss of foundation species is important as previous functional extinctions such as the American chestnut (Castanea dentata) were not properly documented. These data help increase knowledge of forest growth after pest disturbance. Differences in forest recovery between logging and natural death could influence management practices.